The English translation given on Uniformi Insignia and on the Romanian Armed forces website for these technical ranks is Warrant Officer. However unlike most armies where WOs outrank NCOs, the WO ranks appear to have NCO equivalents as described in the NATO report below:

Well, no. Not at all. Basically this is a mistranslation that originates from somebody in the MoD who didn't have a clue. The rank of maistru militar cl. V and sergent are equal, and so are those of other classes. The point of origin for these ranks lies with the creation of the Royal Romanian Air Force, back in 1920, when it was decided to create "military foremen" instead of sergeants, etc, given the technical background and duties of these people. The system was extended after '48, so that nco's with technical duties (and no command duties) were appointed "maistru militar", while nco's with command duties were appointed sergeants etc. So, a "maistru militar" would be a technical nco, equal with any other nco (sergeant upwards).